Knife block



FIG. 1 is a perspective view of a knife block, showing my new design.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a top view thereof.

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a side view thereof.

The broken lines in the figures illustrate the portions of the design that form no part of the claimed design. 

CLAIM The ornamental design for a knife block, as shown and described. 